Java Invoice System with Tax Compliance -- 2

I'm looking for a Java-based system that converts invoices to meet local fiscal requirements, communicates with pertinent tax authorities, and ultimately generates a QR code.

Requirements:
- The system must ensure all converted invoices comply with local tax regulations.
- Invoices need to be converted into PDF format.

Ideal Skills:
- Proficiency in Java programming.
- Strong understanding of local tax regulations.
- Experience in developing invoice conversion systems.
- Knowledge of generating QR codes.

Please note: The specific tax authorities the system needs to communicate with will be provided later. I look forward to your proposals.